| Transmission Range | 0.3 to 6 μm |
| Refractive Index | 1.7085 at 2 μm (1) |
| Reflection Loss | 12.8% at 2 μm (2 surfaces) |
| Absorption Coefficient | 0.05 cm-1 @ 5 μm |
| Reststrahlen Peak | n/a |
| dn/dT | 19 x 10-6 K-1 |
| dn/dμ | n/a |
| Density | 3.58 g/cc |
| Melting Point | 2800°C |
| Thermal Conductivity | 42 W m-1 K-1 @ 273 K |
| Thermal Expansion | 10.8 x 10-6/°C @ 273 K |
| Hardness | Knoop 692 with 600g indenter |
| Specific Heat Capacity | 877 J Kg-1 K-1 |
| Dielectric Constant | 9.65 at 1 MHz |
| Young's Modulus (E) | 249 GPa |
| Shear Modulus (G) | 155 GPa |
| Bulk Modulus (K) | 155 GPa |
| Elastic Coefficients | C11 = 294; C12 = 93; C44 = 155 |
| Apparent Elastic Limit | 138 MPa (20,000 psi) |
| Poisson Ratio | 0.18 |
| Solubility | 0.00062 g/100 g water |
| Molecular Weight | 40.32 |
| Class/Structure | Cubic FCC, NaCl, Fm3m, (100) cleavage |
| Note | MgO crystal is quite difficult to source |
| μm | No | μm | No | μm | No |
|---|---|---|---|---|---|
| 0.171 | 2.319 | 0.382 | 1.7668 | 4.00 | 1.6679 |
| 0.180 | 2.138 | 0.436 | 1.7547 | 5.00 | 1.6373 |
| 0.191 | 2.039 | 0.50 | 1.754 | 6.02 | 1.5957 |
| 0.200 | 1.986 | 0.644 | 1.734 | 7.04 | 1.543 |
| 0.230 | 1.892 | 1.00 | 1.7229 | 8.07 | 1.475 |
| 0.276 | 1.824 | 2.00 | 1.7085 | 9.09 | 1.389 |
| 0.310 | 1.795 | 3.00 | 1.6915 | 10.64 | 1.209 |
Magnesium Oxide is grown in relatively small sizes, mainly in Japan and China. It was grown, along with a number of other xides, in the UK by Spicers at Greenwich, but ceased cintinuity when the proprietor retired. Consequently, It is quite difficult to source.
REFERENCES:
(1) Handbook of Optical constants of Solids II ISBN 0-12-544422-2